Radio receiving apparatus



-- A.'N.. EDMONDS.

RADIO RECEIVING APPARATUS.

. APPLICATION FILED OCT. 21 um.

LSGBAMO Patehtged June 10, 1919. Y

WITNESSES ATTORNEY ceiving the messages may verify their mes- I sets.

UNITED STATES PATENT ALONZO N. EDMONDS, OF CHARLESTON, SOUTH CAROLINA.

' RADIO RECEIVING APPARATUS.

Specification of Letters Patent. Patented June 10, 1919.

Application filed October 2, 1915. Serial No. 53,737.

for its primary object.the provision of a device of this characterwhereby a plurality of messages of diiferent wave lengths may bereceived at one station, and means are also provided whereby theoperators resages by listening in.

Another object of the invention is to pro vide a device of the characterabove described having a plurality of antennae con .nected with aplurality of receiving circuits, means being associated therewithwhereby the plurality of antennae may be utilized for sending a message.

A further object of the invention is to provide a circuit controllingmeans whereby the receiving instruments may be quickly and surelyconnected to the various receivmg c1rcu1ts,the recelvers being connectedin series when one message is received in both With the above and otherobjects in view my invention ,resid'cs preferably in the construction,combination and arrangement of parts as hereinafter set forth in thespecification and illustrated in the accompanying drawings, in which,

The figure is a diagrammatic view of the receiving system of a radiostation.

Similar reference characters designate similar parts throughout thevarious views of the drawings.

In the drawing, I have illustrated my improved system for receivingmessages by radiant energy which includes a plurality of antennae A andB, the antenna A having a conductor 1 leading therefrom to the pri' marywinding 2 of the tuning coil T. The antenna B has a similar conductor 3leading therefrom and communicating with the primary winding 4: of asecond tuning coil T. The conductors 5 and 6 communicate with theprimary windings 2 and 4 and are grounded, as at 7 and 8, respectively.I provide what I term an anchor spark gap which includes thetransmitting conductor 9 having a' terminai'lO disposed between theterminals 11 and 12." Bythe use of the conductor 9 in transmittingamessage both of the antenna: may be utilized. Thetuning coils T and Tare provided with the usual secondary windings 13 and 14:, respectively,said windings 13 and H having the receiving circuits a and b,respectively, extending therefrom. The circuits a. and I) includeconductors 15, 16, 17 and 18, said conductors embracing, respectively,receivers 19 and 2), and the switch arms 21 and 22 of the isolatingswitch S. The usual condensers c and a may be provided and shuntedacross the circuits at and b, respectively. Suitable detectors 23 and 24may be interposed in the conductors 15 and 18, respectively, and theadjustable condensers 25 and 26 may be shunted across said circuits aand 5, respectively. The switch S is provided with a plurality ofintermediate contact points 27 and 28, respectively, said contact pointscommunicating with the conductors l5 and 18, respectiely, by means ofthe jumpers 29 and 30. A shunting switch 31 is disposed between theconductors l6 and 17 for a purpose which will hereinafter appear.

In order to permit listening-in on either of the receiving circuits a orb I provide listening-in circuits as and y and a receiver 32. A two-poledouble-throw switch 33 serves to connect the receiver to one or the otheof the listening-in. circuits.

In operation, I will assume that there are two messages being sent fromdistant stations and it is desired that suchmessages be received intheir entirety at the station represented by the diagrams in thedrawings. To receive a plurality of messages the switch S is allowed toremain in the position shown in the figure, the switch 31 beingmaintained in the open position, as shown in this figure. The tuningcoils T and T are now adjusted to receive messages on the an-' tennze Aand B, it being of course assumed that the messages being received areof different wave lengths, the usual adjust.- ments may be made in thedetectors 23 and 24: and the condensers 25 and 26,. these cir-' racee74- Assuming that it is desired to receive a message of distress or thelike the switch S may be moved to the right. The switch 31 moved to theclosed position which places the receivers 19 and 20 in series. In thisposition the message sent will be received through the tuning coil T. Toreceive a message through the tuning coil T inde pendently of the tuningcoil T the switch 5 is moved to the left. It Will thus be seen thatmessages or different Wave lengths may be simultaneously received by myimproved system, or .very important messages may be received andverified by the two receivers being connected in series. It will also benoted that when it is desired to send message the anchor spark gapcomprising the terminals 10, 11 and 12 is provided to allow the use ofboth antennae which of course gives a Wider area from which the messagemay be delivered.

From the above description taken in connection with the accompanyingdrawings it is thought that a clear and comprehensive understanding ofthe construction, operation and advantages of my invention may bereadily gathered, and While I have shown and described the same asembodying a specific structure I desire that it he undcrstood that I maymake such changes therein Which do not depart from the spirit and scopeof the invention as claimed.

Having fully described my invention what I claim as new is Radioreceiving apparatus, comprising a plurality of antennae, a main circuitfor each antenna including a condenser. a receiver and a detector.switch means in the main circuits to admit of the receivers being usedindependently or in series with either of the circuits, and alistening-in circuit including portions connected with the main circuitsand a portion containing a receiver and a switch to admit of thelistening-in receiver operating \Vl ll either main circuit or bcingrendered inactive.

In testimony vvhcrcof I. aliix my signature in presence of twoWitnesses.

ALHNZU N. EDUONDH. Witnesses THOBIAS J. Noreen, War. H. TOUUU'IONE.

